The word "dance" has been so much debased because the dance has been taken up only by entertainers who have made of it an amusement, and we see that when a thing is made an amusement it always degenerates. When we come to Indian music we find that it has three parts: singing, playing, and dancing. The voice that comes from the lungs and abdomen cannot express itself fully without the bones of the head, the lips, the teeth, the tongue, the palate. So we see that this body is the instrument of sound. When the tree swings in the wind, each leaf gives a sound. The breeze alone cannot produce the full sound. The leaves of the trees rustle and become the instrument for the air. This shows us that the whole framework of this world is the instrument of sound.